Completed:
https://pricecharting.userecho.com/communities/1/topics/751-it-would-be-awesome-if-you-had-the-option-under-games-in-collection-to-have-a-sold-feature-which
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Completed:
https://pricecharting.userecho.com/communities/1/topics/751-it-would-be-awesome-if-you-had-the-option-under-games-in-collection-to-have-a-sold-feature-which